Ralif Redhammer
Legend
I think it could be done, but you’d definitely be increasing your workload as a DM. There would be a significant number of encounters you’d have to adjust.
The big thing, for OOTA to work is for the PCs to not have an immediate way back to the surface. The module uses the "captured by the drow" hook, but the problem with using existing PCs is that the fight ends up being one they cannot win, and that's not generally fun for folks. If you don't want the drow capturing them, then my vote would be for them ending up going through a one-way portal or triggering a teleport trap.
The big thing, for OOTA to work is for the PCs to not have an immediate way back to the surface. The module uses the "captured by the drow" hook, but the problem with using existing PCs is that the fight ends up being one they cannot win, and that's not generally fun for folks. If you don't want the drow capturing them, then my vote would be for them ending up going through a one-way portal or triggering a teleport trap.